US 11,739,006 B2
Water quality measurement device and water quality measurement method
Masahito Yahata, Kyoto (JP); Yuichi Masuda, Kyoto (JP); and Tatsuya Kataoka, Kyoto (JP)
Assigned to Shimadzu Corporation, Kyoto (JP)
Appl. No. 16/624,091
Filed by Shimadzu Corporation, Kyoto (JP)
PCT Filed Jun. 20, 2018, PCT No. PCT/JP2018/023454
§ 371(c)(1), (2) Date Dec. 18, 2019,
PCT Pub. No. WO2018/235865, PCT Pub. Date Dec. 27, 2018.
Claims priority of application No. 2017-121325 (JP), filed on Jun. 21, 2017.
Prior Publication US 2020/0207643 A1, Jul. 2, 2020
Int. Cl. C02F 1/32 (2023.01); C02F 1/72 (2023.01); G01N 27/06 (2006.01); G01N 33/18 (2006.01)
CPC C02F 1/325 (2013.01) [C02F 1/72 (2013.01); G01N 27/06 (2013.01); G01N 33/1846 (2013.01); C02F 2201/322 (2013.01); C02F 2201/326 (2013.01); C02F 2209/40 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A water quality measurement device comprising:
a UV light irradiation portion that has a passage region through which sample water passes and irradiates the sample water with UV light from around the passage region;
an inflow pipe that is arranged to allow sample water to flow into the passage region;
an outflow pipe that is arranged to allow the sample water, which has been oxidized by being irradiated with UV light by the UV light irradiation portion, to flow out of the passage region, the outflow pipe being located downstream of the passage region;
a heat dissipation portion that dissipates heat of the sample water, the heat dissipation portion being provided on the outflow pipe; and
a detector that detects a degradation product that has flowed out into the outflow pipe, the detector being located downstream of the heat dissipation portion,
wherein:
the UV light irradiation portion is a twin tube excimer lamp that has an inner tube in which an internal space is formed as the passage region and an outer tube disposed around the inner tube, and emits UV light by generating a discharge between electrodes provided on an inner peripheral surface of the inner tube and an outer peripheral surface of the outer tube;
the inflow pipe is arranged to allow sample water to flow into the inner tube from one end;
the outflow pipe is arranged to allow the sample water oxidized by being irradiated with UV light in the inner tube to flow out from the other end of the inner tube;
the water quality measurement device further comprises a liquid feed controller that is arranged to repeat an operation of allowing sample water to flow into the inner tube from the inflow pipe, irradiating the sample water in the inner tube with UV light by the excimer lamp with the inflow of sample water stopped to oxidize the sample water, and resuming the inflow of sample water into the inner tube from the inflow pipe to send the oxidized sample water to the detector through the outflow pipe;
the liquid feed controller is arranged to stop the operation of the excimer lamp after sample water in the inner tube has been irradiated with UV light by the excimer lamp and to start the operation of the excimer lamp after the sample water irradiated with the UV light has exited the inner tube; and
the heat dissipation portion dissipates the heat of sample water that has been oxidized by being irradiated with UV light and that flows out of the inner tube into the outflow pipe, allowing the dissipated sample water to flow into the detector.